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server.go
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server.go
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/*
Copyright 2014 CoreOS, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package api
import (
"errors"
"net"
"net/http"
"github.com/coreos/fleet/log"
)
var unavailable = &unavailableHdlr{}
func NewServer(listeners []net.Listener, hdlr http.Handler) *Server {
return &Server{
listeners: listeners,
api: hdlr,
cur: unavailable,
}
}
type Server struct {
listeners []net.Listener
api http.Handler
cur http.Handler
}
func (s *Server) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
s.cur.ServeHTTP(rw, req)
}
func (s *Server) Serve() {
for i, _ := range s.listeners {
l := s.listeners[i]
go func() {
err := http.Serve(l, s)
if err != nil {
log.Errorf("Failed serving HTTP on listener: %v", l.Addr())
}
}()
}
}
// Available switches the Server's HTTP handler from a generic 503 Unavailable
// response to the actual API. Once the provided channel is closed, the API is
// torn back down and 503 responses are served.
func (s *Server) Available(stop chan bool) {
s.cur = s.api
<-stop
s.cur = unavailable
}
type unavailableHdlr struct{}
func (uh *unavailableHdlr) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
sendError(rw, http.StatusServiceUnavailable, errors.New("fleet server currently unavailable"))
}